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Decimal Point Trick Worksheet

Maths tricks trick 24: Where does the decimal point go? · Set 753 · 40 questions
TalentJR

The trick (Count the places): Forget the points and multiply the whole numbers. Count all the digits after the points in the question. Put the point that many places from the right, then check by rounding.

NameDateTime takenScore ___ / 40
  1. 1.2.5 × 0.7 — where does the decimal point go? (a) 17.5 (b) 0.0175 (c) 0.175 (d) 1.75
  2. 2.9.7 × 32 — where does the decimal point go? (a) 3.104 (b) 3104 (c) 31.04 (d) 310.4
  3. 3.0.72 × 2.4 — where does the decimal point go? (a) 1.728 (b) 0.01728 (c) 0.1728 (d) 17.28
  4. 4.2.3 × 4.8 — where does the decimal point go? (a) 1.104 (b) 110.4 (c) 11.04 (d) 0.1104
  5. 5.7.8 × 2.2 — where does the decimal point go? (a) 1.716 (b) 17.16 (c) 171.6 (d) 0.1716
  6. 6.3.8 × 0.9 — where does the decimal point go? (a) 0.0342 (b) 3.42 (c) 0.342 (d) 34.2
  7. 7.9.1 × 0.7 — where does the decimal point go? (a) 6.37 (b) 0.0637 (c) 0.637 (d) 63.7
  8. 8.0.39 × 0.8 — where does the decimal point go? (a) 0.312 (b) 0.00312 (c) 3.12 (d) 0.0312
  9. 9.0.22 × 2.8 — where does the decimal point go? (a) 0.616 (b) 0.0616 (c) 0.00616 (d) 6.16
  10. 10.4.2 × 0.3 — where does the decimal point go? (a) 0.0126 (b) 1.26 (c) 12.6 (d) 0.126
  11. 11.7.3 × 19 — where does the decimal point go? (a) 138.7 (b) 1.387 (c) 13.87 (d) 1387
  12. 12.0.64 × 3.3 — where does the decimal point go? (a) 21.12 (b) 0.02112 (c) 2.112 (d) 0.2112
  13. 13.2.7 × 0.8 — where does the decimal point go? (a) 21.6 (b) 0.216 (c) 0.0216 (d) 2.16
  14. 14.8.1 × 2 — where does the decimal point go? (a) 1.62 (b) 0.162 (c) 162 (d) 16.2
  15. 15.3.6 × 2.4 — where does the decimal point go? (a) 0.864 (b) 86.4 (c) 8.64 (d) 0.0864
  16. 16.0.76 × 11 — where does the decimal point go? (a) 0.0836 (b) 0.836 (c) 8.36 (d) 83.6
  17. 17.0.38 × 3.8 — where does the decimal point go? (a) 0.01444 (b) 1.444 (c) 0.1444 (d) 14.44
  18. 18.0.84 × 4.2 — where does the decimal point go? (a) 0.03528 (b) 0.3528 (c) 35.28 (d) 3.528
  19. 19.6.6 × 0.3 — where does the decimal point go? (a) 0.0198 (b) 19.8 (c) 0.198 (d) 1.98
  20. 20.9.6 × 1.4 — where does the decimal point go? (a) 1.344 (b) 13.44 (c) 134.4 (d) 0.1344
  21. 21.5.2 × 26 — where does the decimal point go? (a) 1352 (b) 13.52 (c) 1.352 (d) 135.2
  22. 22.8.1 × 9 — where does the decimal point go? (a) 729 (b) 72.9 (c) 0.729 (d) 7.29
  23. 23.9.4 × 0.3 — where does the decimal point go? (a) 0.0282 (b) 0.282 (c) 28.2 (d) 2.82
  24. 24.0.44 × 27 — where does the decimal point go? (a) 118.8 (b) 0.1188 (c) 11.88 (d) 1.188
  25. 25.0.53 × 0.4 — where does the decimal point go? (a) 0.0212 (b) 0.212 (c) 2.12 (d) 0.00212
  26. 26.5.7 × 13 — where does the decimal point go? (a) 74.1 (b) 7.41 (c) 741 (d) 0.741
  27. 27.0.47 × 2.8 — where does the decimal point go? (a) 0.01316 (b) 1.316 (c) 13.16 (d) 0.1316
  28. 28.0.28 × 0.2 — where does the decimal point go? (a) 0.56 (b) 0.056 (c) 0.0056 (d) 0.00056
  29. 29.1.3 × 47 — where does the decimal point go? (a) 6.11 (b) 0.611 (c) 611 (d) 61.1
  30. 30.4.1 × 0.6 — where does the decimal point go? (a) 2.46 (b) 24.6 (c) 0.246 (d) 0.0246
  31. 31.0.53 × 0.6 — where does the decimal point go? (a) 0.318 (b) 0.0318 (c) 3.18 (d) 0.00318
  32. 32.3.8 × 0.2 — where does the decimal point go? (a) 0.076 (b) 7.6 (c) 0.76 (d) 0.0076
  33. 33.0.12 × 2 — where does the decimal point go? (a) 2.4 (b) 0.24 (c) 0.024 (d) 0.0024
  34. 34.5.9 × 4 — where does the decimal point go? (a) 23.6 (b) 2.36 (c) 0.236 (d) 236
  35. 35.2.4 × 1.7 — where does the decimal point go? (a) 0.408 (b) 4.08 (c) 40.8 (d) 0.0408
  36. 36.0.49 × 8 — where does the decimal point go? (a) 0.0392 (b) 3.92 (c) 0.392 (d) 39.2
  37. 37.8.3 × 14 — where does the decimal point go? (a) 116.2 (b) 1.162 (c) 1162 (d) 11.62
  38. 38.4.7 × 11 — where does the decimal point go? (a) 51.7 (b) 517 (c) 5.17 (d) 0.517
  39. 39.0.43 × 2.3 — where does the decimal point go? (a) 0.0989 (b) 9.89 (c) 0.00989 (d) 0.989
  40. 40.0.67 × 7 — where does the decimal point go? (a) 0.0469 (b) 4.69 (c) 0.469 (d) 46.9

Answer key

  1. 1.75
  2. 310.4
  3. 1.728
  4. 11.04
  5. 17.16
  6. 3.42
  7. 6.37
  8. 0.312
  9. 0.616
  10. 1.26
  11. 138.7
  12. 2.112
  13. 2.16
  14. 16.2
  15. 8.64
  16. 8.36
  17. 1.444
  18. 3.528
  19. 1.98
  20. 13.44
  21. 135.2
  22. 72.9
  23. 2.82
  24. 11.88
  25. 0.212
  26. 74.1
  27. 1.316
  28. 0.056
  29. 61.1
  30. 2.46
  31. 0.318
  32. 0.76
  33. 0.24
  34. 23.6
  35. 4.08
  36. 3.92
  37. 116.2
  38. 51.7
  39. 0.989
  40. 4.69

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